- Arm B: Patients receive alemtuzumab as in arm A. Patients also receive low-dose rituximab IV on days 6, 8, 10, 13, 15, 17, 20, 22, 24, 27, 29, and 31 in cycle 1 and on days 1, 3, 5, 8, 10, 12, 15, 17, 19, 22, 24, and 26 in cycless 2 and 3. Treatment repeats every 28 days for up to 3 cycles.